Researchers studying mouse proteins uncover part of `choreography of immunity`
(PHYSorg.com Chemistry)

Rearranging the genome is a risky endeavor, and human cells reserve it for special occasions, like making egg and sperm cells. Now, researchers at Johns Hopkins Medicine announce they`ve learned how an enzyme that reshuffles DNA on one of those rare occasions-during the birth of new white blood cells-helps ensure the process doesn`t go haywire. Their results are described online this week in the Proceedings of the National Academy of Sciences.